Observation apparatus for printing presses and the like



Sept. 10, 1940. H. FISCHER OBSERVATION APPARATUS FOR PRINTING PRESSES AND THE LIKE Filed Jan. 25., 1938 2 Sheets-Sheet 1 H. FISCHER Sept. 10, 1940.

OBSERVATION APPARATUS FOR PRINTING PRESSES AND THE LIKE 2 sheets sheet 2 Filed Jan. 25, 1938 UNITED STATE Patented Sept. 10, 1940' OBSERVATION PPARATUS FOR. PRINTING PRESS S AND THE LIKE Hans Fischer, Goggingen, near Augsburg, Germany, assignor to Maschinenfabrik Augsburg- Nuremberg A. G., Augsburg, Germany, a corporation of Germany Application January 25, 338, Serial No. 186,858 In Germany January25, 1937 I 5Claims. (01.88-14) My invention relatesto apparatus adapted for observing recurring symbols, or the like, appearing on continuous webs of paper or other niaterial while in motion. In devices of this kind, 6 the image of the symbol, or the like is caught by a mirror, which is turned corresponding to the travelling movement of the 'symbolyor the like in such a way that the direction and positionof the light ray reflected by the mirrorremain always the same to the observer in every position of the -travelling.symbol, or the like.- After the execution of a partial rotation, the mirror returns to its initial position.

Now, the particular object of this invention is to so design the observation apparatus that it can be readily adjusted to any point of the travelli ng web andfurthermore that it can be readily adapted to various sizes or formats.

Another object of the invention is the pro- 90 vision of observation apparatus of the character mentioned which is so arranged that the distance between the mirror andthe traveling web can be readily changed and-in which the parts are capable of convenient operation and readily 'accessible for adjustment and for observation purposes.

The construction of my new apparatus will appear more clearly from the following de'scription with -reference-to the appended drawings, in

which I have shown,'by'way of illustration, an

embodiment of my invention; and in which Fig. 1 is a longitudinal section through the support from which the observation-apparatus is suspended, the latter being shown in elevation; 35 Fig. 2 is. a section through the observation'apparatus; Fig. 3 is a section through the same taken at right angles to that shown in Fig. 2. Fig. 4 is a section through a portion of the suspension means taken at right angles to that 40 shown in Fig. 1; Fig. 5 is a detail view.

tatably mounted in the supporting tube- 4. co-

axially therewith. At 8 and 9 in Fig. 1 are shown two toothed gear wheels, the wheel 8 being as, a.

cured to hollow shaft I, whereby the latter may be rotated from a suitable source of power, not shown. Atliinmlisshownabwelgear of shaft IS the oscillatingly mounted mirror supporting tube wheel mounted on the hollow shaft I for rotation therewith. -At II is shown a' similar bevel gearwheel in mesh with gear wheel 10 and secured to a shaft l2 rotatably mounted within the tubumitted to a horizontal shaft shown at l5 rotatably journalled in suitable bearings in thecasing of the observation apparatus. 'By means shown at 16 in Figs. 2 and 3 is operated, as will be describediurther below. i

In Fig. 1 the horizontal supporting tube 4 isshown provided along its lower side with an elongated slot I] to epable the shaft 12 to travel 20 in said slot. Now, if it is desired to displace the observation apparatus horizontally along the 4,, this is accomplished, after first releasing'the clamping device 23, shown-in Fig. 5, by a corresponding rotation of a handwheel shown at [8 in Figs. 1 and 4, which by means of its hub is rotatably mounted on the tubular support 2 and .which, by .means of a toothed gear wheel [9 rotates a stem shown at 20 in Fig. 4, and which at its upper end carries -80 a toothed gear wheel 2| which meshes with the teeth ofa horizontallydisposed rack 22 on the supporting tube I. Therefore. as the hand- I wheelilfl is rotated, the toothed gear wheel 2| will move along the rack 22, and thereby the 86- observation apparatus will travel either to the left or to the right in Fig. 1 depending on the direction of rotation of the hand-wheel l8. As the tubular support is displaced to the right or left from the position shown in Fig. 1, the gear ll is caused to travel axially along the shaft' I by means of a key 89 which engages an annular slot in the hub portion of thegear |0,'the pin 39 being the clamping device shown at 23 in-Flg. 5 is first l0 released whereupon. the tubular support 2 can be rocked about the horizontal supporting tubel to .either' side .thereof. During this rocking movement the teeth of the gear 2| maintain the meshing relationship with the teeth of the rack I 22 since those teeth extend annularly to a suflicient degree to permit this, as will be apparent from the dotted line illustration of the rack teeth shown in Fig. 5. Thus thetubular support '2 can be so adjusted that the apex 24 of the observation angle a is moved to 24, the observation angle being the angle through which the mirror is turned during the time any point on the travelling web is kept in view and apparently substantially stationary as viewed by the operator through the observation duct 42 which extends, as shown in Figs. 1 and 4, in a direction parallel to the axis of the tube 4 and in line with a reflector 43 interposed between the mirror l6 and the eye piece. 1 While the observation angle a remains unchanged, the range of the observation apparatus is thereby increased from 25, 26 to 25', 26' (Fig. 4). Thus if the distance between points 25' and 26' represents the distance between repetitions of the same symbol, on the printed web, that symbol will be viewed by the operator each time the mirror is turned so that the line of sight will. follow theweb. It should be noted that during the rocking operation of the observation apparatus about the tube 4, the rocking axis coincides with the axis of the operating shaft l. The change in the range of observation adapts the machine to a larger format obtained from a larger diameter printing roll, it being understood that the R. P. M of the printing roll bears a definite relationship to the R. P. M. of the gear 8 and shaft 7.

However, since the median plane of the casing of the observation apparatus after the said rocking operation will no longer be parallel with the paper web, the casing must be readjusted so that the line halving the observation angle or again is perpendicular to the traveling web to be observed (Fig. 4). In order to accomplish this, I provide a crank-shown in Fig. 3 at 21, whereby I can rotate a worm 28 (Fig.2) which engages, and imparts its rotation to, a wormwheel 29. Thereby the casing of the observation apparatus is moved about the axis of the shaft I5 to a position, in which the line halving the observation angle a is again perpendicular to the moving paper web.

On shaft I5 is mounted a toothed gear wheel 3|] of a planetary gear. This toothed wheel, by means of an intermediate toothed gear wheel 3i transmits its rotation to a crown-wheel 32, which is coupled with a cam shown at 33 against whose periphery is pressed by a spring (not shown) the lever 34 carrying the mirror 16 (Fig. 3) so that the latter' executes a partial rotation. The intermediate 'gearwheel 3| is secured to a spindle 35 journalledin the worm wheel 36 so that by a rotation of the latter by means of the worm 3i and a crank shewn at 38. the intermediate gear wheel 3| and thereby the cam 33 can be adjusted relative to the shaft Hi. In this manner, the observation point can be adjusted in. the direction'of the moving paper web.

While I have herein described and shown an embodiment of my invention, the same is, of

course, not limited to this embodiment, as various modifications may be made without a departure from the essence and gist of the invention.

I claim: 1'. Apparatus for observing symbols or the like on a traveling web comprising web-guiding means providing an observable path for the web,

a mirror for reflecting'the light rays from a web traveling in said path. a housing, -mieans supporting said mirror in said housing, for movement about an axis transverse of said path and in a plane parallel thereto, means for viewing the mirror, means for turning the'mirror on said axis to maintain light rays reflected from a point on a web traveling in said path in a substantially. stationary position in the viewing means, means supporting said housing for movement about another axis spaced from said first axis and parallel thereto for changing the distance between the mirror and said'path, and means for adjustingsaid housing on said supporting means about another axis spacedfrom the aforesaid axes and parallel thereto.

2. Apparatus for observing symbols or the like 'on a traveling 'web comprising web-guiding means providing an observable path for the web, a mirror for reflecting the light rays from a web traveling in said path, a housing supporting said mirror therein for oscillatory movement about an axis transverse of said path and in a plane parallel thereto, an observation duct extending transversely with respect to the web path in a plane parallel thereto for viewing the mirror from a point outside of the housing, means for turning the mirror to maintain light rays reflected from .a point on a web traveling in said path in a substantially stationary position as viewed in the observation duct and for periodically returning the mirror to an initial position, means mirror therein for oscillatory movement about an axis transverse of said path and in a plane parallel thereto, means for viewing the mirror,

means including a driving shaft and a rotatable cam for turning the mirror on its axis to maintain light rays reflected from a point on a web traveling in said path in a substantially stationary position as viewed in the viewing means and for periodically returning the mirror to an initial position, means supporting said housing for movement about axes spaced from the mirror axis and parallel thereto for changing the distance between the mirror and said path, and adjustable compensating means between the cam and the shaft for changing the timing of the cam. i

4. Apparatus for observing symbols or the like on a traveling web comprising web-guiding means providing an observablepath for the web, a mirror for reflecting the light rays from a web traveling in said path, a housing supporting said mirror therein for movement about an axis transverse of said path and in a plane parallel thereto, means for viewing the mirror, means for turning the mirror on its axis to maintain supporting -member, carrying means mounted 7'5 ally supporting said housing on said carrying member for movement about an axis parallel to andspaced from said supporting member and from the mirror axis, and means in said carrying member and said housing operably interconnecting said shaft to said mirror turning means.

5. Apparatus for observing symbols or the like on a traveling web comprising web-guiding means providing an observable path for the web,

a mirror for reflecting light rays from a web traveling in said path, a housing supporting said mirror therein for oscillatory movement about an axis transverse of said path and in a plane parallel thereto, an observation duct for viewing the mirror from a point exterior of said housing,

means for turning the mirror to maintain light rays reflected from a point on the web traveling in said path in a substantially stationary position as viewed in the observation duct and for periodically returning the mirror to an initial position, a horizontal supporting tube extending transverse of said web path and in a plane parallel thereto, a drive shaft in said tube and concentric therewith, carrying means depending from and mounted onsaid tube for movement about the axis thereof, means pivotally supporting said housing on the lower end of said carrying means for movement about an axis spaced from the mirror axis and from the tube and parallel thereto, and means in said carrying means and said housing operably interconnecting said shaft to- 15 said mirror turning means.

HANS FISCHER. 

